Vat dye.



UNITED snares rarnn'r oar-ion.

ALEXANDER HAMBURGER, OF ELBERFELD, GERMANY, ASSIGNOR TO F.ARIB1il1\l'-- FABRIKEN VORM. FBIEDR. BAYER & :0,, 0F ELBERFELD, GERMANY, A CORPO- BATION QF GERMANY.

No Drawing.

To all whom it may concern Be it known that I, ALEXANDER Harr- BURGER, doctor of philosophy, chemist, citizen of the German Empire, residing at El-.

berfeld, Germany, have invented new and useful Improvements in Vat Dye, of which the following is a specification. I have found that new and valuable col0ring matters dyeing cotton from the alkaline hydrosulfite vat generally from yellow to orange to red shades can be obtained by treating chloroanthraquinone with alkaline sulfids.

' 'The new dyes being thioethers having anilin, which solution is heated to 130 C.

The melt which has to be stirred is kept at this temperature during about 15 hours until a test portion is soluble in concentrated sulfuric acid with a greenish-blue coloration. The anilin is then driven over with steam, the precipitate is filtered ofi', stirred up with water and dilute hydrochloric acid in order to remove the anilin and then it is washed with hot water.

The 5.5-dibenzli)yldiamine-2.2'dianthraquinonylthioether having most probably the formula:

is after being dried "and pulverized a, yellow powder crystallizing from nitrobenzene in the shape of yellow needles which are soluble in concentrated sulfuric acid with a Specification of Letters Patent.

Application filed December as, 1911'.

. nonyl VAT DYE.

Patented Get. 2?, Serial No. 667,630.

suchv as 1benzoylamino-5-chloroanthraquinone (orange dye), 1-amino-5-chloroanthra qumone (salmon red dye), 2-chloroanthra quinone (yellow dye), l-chloroanthraquinone (reddishyellow dye),1.5-dichloroanthraquinone (orange dye), 1 amino 2 methly-4-chloroanthraquinone (red dye).

- I claim 1. As new products, the dianthraquinonyl sulfids of the general formula R-SR, wherein R and R stand for anthraquino-nyl residues and S for sulfur, being powders which are diflicultly soluble in organic solvents, insoluble in dilute alkalis and diluteacids, and yielding, when treated with concentrated sulfuric acid, solutions of a characteristic color.

2. The herein described new vat dye being the 5.5 dibenzoylamino 2.2 dianthraquinonylthioether having most probably the formula:

Nn co-c6n5 which is after being dried and-pulverized a yellow powder crystallizing from nitrobenzene in the shape of yellow needles which are soluble in concentrated sulfuric acid with a greenish-blue coloration; and dyeing cotton from an alkaline hydrosulfite vat yellow fast shades, substantially as described. v

3. As new products the -t-dianthraquisulfids of the general formula RS-R, wherein R and R stand for the anthraquinonyl residues and S for sulfur, being powderswhich are difficultly soluble in organic solventsinsoluble in dilute alkal s and dilute acids, and yielding, when treated with concentrated sulfuric acid, solutions of a characteristic color.

4. As a new process, the nmnufacture of In testin'iony whereof I have hereunto set; the dla-nthraqulnonyl sulfide of the general my hand 1n the presence of two subscmblng formula P-SR, whereln R and R \vltncsses.

stand for anthraquinonyl residues and S ALEXANDER IIAMBURGER. [L. s.] 5, for sulfur, by treating about two molecules \Vitnesses:

O halogen-anthraqulnone with about one HELEN NUFER,

mulecule. ofelkali metal s ulfid. A. NUFER.

Copies 04. this patent may be obtained for fivecents each, by addressing the Commissioner of Eat-ants,

-, V e v Washington, D. C. e 

